On Sunday, Musk tweeted that he had a "promising call" with Bosch, the company that builds the radar sensor used in Tesla's cars, and that "significant improvements" to the system could be possible through an over-the-air software update. If that proves accurate, Tesla could upgrade the tens of thousands of Model S and Model X vehicles equipped with the semi-autonomous system without needing to call the vehicles in for physical repairs. (Tesla frequently uses OTA updates for its vehicles.)

While much remains unknown about the crash that killed Tesla driver Joshua Brown back in May, one thing appears certain: If the radar and camera systems connected to his Model S's Autopilot had spotted the tractor trailer turning in front of him, his Tesla would have jammed on the brakes. In a Twitter post that has since been taken down, Musk claimed that the Autopilot's radar system is programmed to ignore high-mounted objects such as road signs—and, possibly, the flanks of a semi truck—to avoid undesired braking events.